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Finding the Fourth Proportional to 43.88, 65.77 and 21.05

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Solution

The fourth proportional to 43.88, 65.77 and 21.05 is: 31.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.88 : 65.77 = 21.05 : x
  2. Step 2: Convert to fraction form
    43.88/65.77 = 21.05/x
  3. Step 3: Cross multiply
    43.88x = 65.77 × 21.05
  4. Step 4: Simplify right side
    43.88x = 1,384.46
  5. Step 5: Solve for x
    x = 1,384.46/43.88
  6. Step 6: Final answer
    x = 31.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.